Version Latest
Fiddler 5.7.1
Author
Requirements
Windows / Windows 10 / Windows 11 / Windows 7 / Windows 8
Size
6.3 MB

Fiddler allows you to capture, examine, and debug traffic from any web browser. Debug web traffic from any Windows-based PC, Mac, or Linux system, including mobile devices. Telerik Fiddler Web Debugger is here to help, regardless of the platform or language you use to develop. Enjoy!

Which Fiddler Do I Need?

Five products in one family, with endless debugging and troubleshooting capabilities.

Fiddler Everywhere 
The most powerful web debugging proxy tool for MacOS, Windows, and Linux, with an improved UI. Built-in team collaboration allows you to effectively discuss your findings and provide context. Create, save, and share rules to handle complex requests with ease. 

Fiddler Classic 
The original reliable and secure (free) debugging proxy server for Windows. Successfully log, examine, and modify HTTP network requests and server responses. Go from error to remedy in record time. Easily import/export requests in a variety of formats, eliminating the guesswork. 

Fiddler Jam 
A web-based end-to-end troubleshooting tool for support teams looking to move from problem to fix in less time. In three simple steps, you can capture web traffic, console logs, and pictures of web apps. The setup is simple and doesn't involve any programming. Securely share all captured logs with your teams to swiftly provide vital data for problem-solving. 

Fiddlers Cap 
A lightweight version of the software for Windows that is aimed at non-technical users to take data. Capture online traffic and instantly transfer it to your technical team for troubleshooting. Eliminating the annoyances caused by hampered communications. To speed up the resolution process, share network traffic records with your teams. 

Fiddler Core 
Reliable and powerful.NET library for capturing and modifying HTTP and HTTPS traffic, ensuring that everything runs smoothly and securely. Use the power of a stable proxy engine to create best-in-class features for your projects and demonstrate your innovation. Discover delays, missing services, and risks in minutes, not days.

How to Start Your Fiddler Journey

  • Try the Fiddler product(s) that best meet your needs. 
  • Integrate Fiddler into your workflow to enable quick, easy debugging and troubleshooting. 
  • You'll begin to realize the app's high worth through increased time and cost savings.

Features and Highlights

Web Debugging 
Debug traffic from PCs, Macs, Linux, and mobile devices. Ensure that the appropriate cookies, headers, and cache directives are transmitted between the client and server. Supports any framework, including .NET, Java, and Ruby. 

Performance Testing 
It shows you the "total page weight," HTTP caching, and compression at a glance. Isolate speed bottlenecks with rules such as "Flag any uncompressed responses larger than 25kb." 

HTTP/HTTPS Traffic Recording 
The program is a free web debugging proxy that records all HTTP communication between your PC and the Internet. It may be used to debug traffic from almost any proxy-compatible application, including Internet Explorer, Chrome, Safari, Firefox, Opera, and others. 

Web session manipulation 
You can easily control and edit web sessions. All you need to do is add a breakpoint to pause session processing and allow for changes to the request/response. You can also create your own HTTP queries and run them via the program. 

Security Testing 
Use the tool to test the security of your web apps by decrypting HTTPS traffic and displaying and modifying requests with a man-in-the-middle decryption approach. Configure the app to decrypt all traffic or just certain sessions. 

Telerik Fiddler has a flexible extensibility paradigm, allowing for basic FiddlerScript and complex Extensions written in any.NET language.

A Trial of Any of the Fiddler Products Gives You

  • A fully operational version of the software. 
  • Strict data privacy protections. Your info is private and will never be shared.​ Simple upgrade path to a licensed product. 
  • Complete access to the online documentation, community forums, and tutorials.

Conclusion

To summarize, installing Fiddler is an excellent choice for anyone interested in web development, debugging, or performance optimization. Fiddler's robust capabilities and user-friendly interface make it a full solution for recording, examining, and modifying web traffic. Whether you're troubleshooting, monitoring network performance, or testing web applications, Fiddler has the tools you need to diagnose faults and increase productivity. Furthermore, its extensibility through scripts and add-ons provides flexibility and customization to meet your individual requirements. Don't rely on guesswork - download Fiddler today and obtain vital insights into your online traffic to improve development and optimization!

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